J.D. Callahan

Police Procedural & Murder Mystery Author

Retired detective and DA investigator J.D. Callahan writes police procedurals in the murder mystery genre. Explore her debut novel, Reluctant Witness.

Police procedural fiction, written from the inside.

Real-world experience. Fictional cases. No wasted detail.

Meet J.D. Callahan

New to fiction, but not new to writing, J.D. spent decades in law enforcement, including a long career with the San Jose Police Department and later as a district attorney investigator in Monterey County, where her work focused heavily on major investigations including murders, officer-involved shootings, and in-custody deaths.

Featured Book: Reluctant Witness

J.D.’s debut novel is Reluctant Witness, the first in the Sonja Soto Murder Mysteries series.

A struggling crime victim becomes a reluctant witness when she attends a mystery writer’s conference and gets more than she bargained for.

A chance for romance turns into an unlikely partnership when Sonja and Ares Adams bump into one another before they happen across a double murder at the conference venue. When a homicide detective tries to frame Ares, the would-be couple set out on a hunt for the killer.

Twists and turns ensue as our heroes sort through the possibilities, personalities, leads, personal grievances, and a bureaucracy in this police procedural.

A new chapter, years in the making

After a career built on thousands of reports and decades of investigative work, J.D. has completed the first draft of her first police procedural novel, Reluctant Witness. This is the start of a new pursuit, built on discipline, craft, and a deep respect for the details that make a story feel real.

Recent Posts

Crime doesn’t stay on the page. J.D. writes about the craft, the cases that inspired her, and the details that most fiction gets wrong.

Backstory

Working Undercover

I joined SJPD at 19 wanting to work undercover. Over the years I played a dealer, a pimp, a rogue cop, a pornographer. It’s not the glamour TV sells. Here’s how those characters became fiction.

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Backstory

The Utility Investigator

SJPD detective assignments last three years. I worked sexual assault, child exploitation, burglary, narcotics, and eight years of crime scenes. They called us “Utility Investigators.” Here’s where the stories start.

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